Tie hash Segmentation fault

gam3 has asked for the wisdom of the Perl Monks concerning the following question:

This code is causing perl to issue a Segmentation fault on a Debian Squeeze machine.

use Apache::Session::File;

tie %s, 'Apache::Session::File', undef, {
Directory     => '/tmp/sessions',
};

$s{'bob'} = "bill";
[download]

oddly

use Apache::Session::File;

tie my %s, 'Apache::Session::File', undef, {
Directory     => '/tmp/sessions',
};

$s{'bob'} = "bill";
[download]

does not Seg fault.

UPDATE: fixed typos.

-- gam3
A picture is worth a thousand words, but takes 200K.